Lens for lamps.



- v PATBNTED JULY 17, 1906. s.' er WHITBEOUSE. v LENS. FOR LAMPS.

.APPLIOATION FILED NOV. 1, 1904.

UNITED STATES PATENT OFFICE.- SAMUEL GROVES WHITEHOUSE, (ERMINGHAM, ENGLAND.

' LENS FOR LAMPS.

Specification of Letter s Patent.

Patented July 17, 1906.

Application filed November 1, 1904. Serial No. 231,025-

To all whom it may concern:

Beit known that I, SAMUEL GROVESWHITE- HOUSE, cab proprietor, a subject of the King of Great Britain, residin g at Phoenix Works, Aston Road, Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in Lenses for Lamps, of which the following is a specification. a

This invention relates to lenses for lamps, and more particularly, though not exclusively, to lenses for lamps for vehicles.

The object of the said invention is to increase the brilliancy of the light of said lamps to a greater degree than has been possible heretofore.

According to the said invention the lens is oval and is constructed, in such manner that it has a central oval portion of Plano-convex fglrmation which projects outwardly beyond a annular and surroundin oval portion of plano-concave formation, t e face or outer wall of the circumferential groove so formed being a continuation of the downwardly-sloping wall of the central fprojecting portion and the outer margin on the t 1iircurnfrgentifl oove slo in u wan y to e perip cry 0 fl ie lens. 'lhi rgsult of this combination of the surfaces of oval form is that the light appears greatly intensified in the central oval portion of the lens b converging rays, while the surrounding ova and concave portion is a transverse section of the lensportion of the I lamp, and Fig. 2 is a front view thereof.

A is the oval projecting lano-convex portion ofthe lens, and B and 0 different portions of the lano-concave portion or concentric oval concave groove that extends around the central oval projection andv to the periphery of the lens. ,The dottedlines indicate a pencil of rays emanating from the source of ght Within the lamp.

- What I claim, and desire to secure by Letters Patent of the United States, is

A lens having a central, oval plano-convex part surrounded by an oval plano-concave portion beyond which the convex part projects, the oval concave portion extending from the central projection to the periphery of the lens.

In testimony whereof I have hereunto set my hand, in presence of two. subscribing Witnesses, this 11th day of October, 1904.

SAMUEL GROVES WHITEHOUS'E.

Witnesses:

SIDNEY ARTHUR STANLEY, REGINALD SMITH. 

